It would also be quite unethical to resell educational priced film, for a profit.

Not to mention, it's probably against the Terms of Sale, if the supplier finds out you'd probably be banned as a customer.
(Ever read the Terms and Conditions of things like MS Office Student Editions? Absolute minefield of do and don't terms, technically you can get in a lot of trouble for using them the wrong way, it's just that they don't bother chasing you most of the time)

An awful lot of electrons were terribly inconvenienced in the making of this post.